Yeah im a lil late but you should def need to go to the dealer and complain. they had this problem on the GTRs ask Sharif at forged performance... he had the same problem himself with his white GTR. The Dealer will replace your bumpers for you
if your good you might be able to get them to get you the nismo bumpers
you may have to offer to pay the difference but that is a price I would sure as heck pay!!!
GL PW Brethren!